Photo: Mannie Jackson. Story reposted from Feb. 22, 2015 on my former website. By TOM SHANAHAN A treasure trove of untold sports stories pivotal to integration can be still uncovered a half-century later. The 1950s and 1960s media avoided racial issues, leaving stories of figures on the right side of history to be revealed. This was demonstrated to me once again in separate interviews with a pair of University of Illinois alums: Jesse Jackson and Jerry Colangelo. Jackson,…